Connecting Devices To The Network - Texecom Premier 48 Installation Manual

Installation

Connecting Devices to the Network

Before connecting keypads, zone expanders and output
modules, isolate ALL power from the control panel (AC Mains
& Battery). Do not continue if there is still power present on
the control panel.
Connecting devices with power still present on the
control panel may damage the device or control panel
and invalidate any warranty.
Keypads, zone expanders and output modules are all connected
to the same network terminals located at the bottom left hand
corner of the control panel and may be connected serially (daisy
chain), in parallel (star) or any combination of the two (see
Figure 1, page 13 for details).
No more than 8 zone expanders, 8 keypads and 4 output
modules can be connected to each network.
The maximum number of devices that can be connected
in total will depend on the control panel fitted.
Whenever new devices are connected to the networks, they
must be confirmed onto the system using the 'Confirm
Devices' menu option (see page 94 for details).
Wiring the Network
The networks are made up of four terminals incorporating
power and data. To ensure correct operation, all four
terminals on the device must be connected to the
corresponding terminals on the control panel, or previous
device (see Figure 1, page 13 for details). The table below
shows each terminal and its description:
Terminal
+
-
T
R
Devices can be connected using 4-core cable. However, it is
recommended that 6 or 8-core cable is used as the spare cores can
be used to 'Double Up' on the power connections if needed.
Standard 7/0.2 alarm cable can be used for most
installations. However, under certain conditions it may
be necessary to use screened cable.
Cable Distances
The maximum recommended distance for devices when
using standard 7/0.2 alarm cable is:
•
250m for each branch when using the star (parallel)
configuration
•
When using a daisy chain (series) configuration the
maximum distance will depend on the number of devices
connected on the chain. The more devices that are
connected, the shorter the distance to the last device
(this is due to voltage drop in the cable)
Whichever method of wiring configuration is used, ensure
that the voltage between the '+' and '–' terminals at each
device is no lower than 10.0V when the system is running on
the standby battery.
12
Description
+12V Supply
0V Supply
Transmit Data
Receive Data
Premier 48, 88, 168 & 640 Installation Manual
The table below shows maximum cable runs when one
keypad or expander is installed using standard 7/0.2 alarm
cable with various loads:
Configuration
1. Keypad + 2 PIR's @15mA
2. Expander + 2 PIR's @15mA
3. Expander + 8 PIR's @15mA
4. As No. 3 + 16Ω Speaker
Distances of up to 1km can be achieved between the control
panel and a device. However, a power supply must be installed
close to the device to power it locally, this will help to
overcome voltage drop caused by the long cable run.
Overcoming Voltage Drop
There are several ways to overcome voltage drop:
•
Use thicker lower resistance cable. Standard 7/0.2 alarm
cable has a resistance of 8Ω per 100m
•
Double up on the power connections – this will require
using a 6 or 8-core cable rather than a 4-core cable
•
Install a power supply to power the device locally,
remember to common the two negative connections
Installing a Power Supply
When a power supply is installed, the 0V connections on the
power supply must be connected through to 0V on the
control panel and the +12V connection between the control
panel and the device must be disconnected (see Figure 2,
page 13 for details).
Network Diagnostics
Each network has two LED's to indicate data flow. The red
LED indicates data flowing out of the 'T' terminal and the
green LED indicates data flowing into the 'R' terminal. The
table below shows each LED status and its meaning:
LED Status 'T' Wire OUT
Red LED Flashing
Red LED On Panel Fault
Red LED Off Panel Fault
LED Status 'R' Wire OUT
Green LED Flashing Panel Fault
Green LED On Panel Fault
Green LED Off
The LED's are provided as an aid for fault finding and
therefore should not be completely relied upon to
indicate that there is a fault.
Max. Cable Run
250m
250m
100m
30m
'T' Wire IN
Normal Normal
Cable Short
Panel Fault
'R' Wire IN
Normal
Cable Short
Normal No Data From Devices
INS176